diff --git a/rust/day6/Cargo.lock b/rust/day6/Cargo.lock
new file mode 100644
index 0000000..f570fc4
--- /dev/null
+++ b/rust/day6/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc-day6"
+version = "0.1.0"
diff --git a/rust/day6/Cargo.toml b/rust/day6/Cargo.toml
new file mode 100644
index 0000000..d5d29da
--- /dev/null
+++ b/rust/day6/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "aoc-day6"
+version = "0.1.0"
+edition = "2021"
+authors = ["Yohan Boujon <yoboujon@gmail.com>"]
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[workspace]
diff --git a/rust/day6/exemple b/rust/day6/exemple
new file mode 100644
index 0000000..848af1c
--- /dev/null
+++ b/rust/day6/exemple
@@ -0,0 +1 @@
+nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg
\ No newline at end of file
diff --git a/rust/day6/input b/rust/day6/input
new file mode 100644
index 0000000..4d1cd5b
--- /dev/null
+++ b/rust/day6/input
@@ -0,0 +1 @@
+djhjvjggdzznllvvrvggscgscsrrffgvfvllfclcrchhwzhzqqlhqhffsdsmmcffnggcttdpttwpwttjvtjvtvqqctcwcmcsswvwzzlnzlnnvbnbdnngmmhchrcrqqhbhllbtllmppgjjtvjvdjvvpcpjcjjfrfzfzzdvzdvvswvvjzzbpzbzzddbndbbgjbjjvpjpjtjqtjqjcjmcjjrtjrjrqqvtvpvwpprhphrhdrddpdhhfsspddqnqwnntrtnrrthrhtrtwtdttmmnvmnmppswsqwqjqwqbqrqbqdbqdqgdqgqtgqqgzzhpzzwswvwmvwwvvrzznwzzbsbhbfhhvcvwvvrzrgzzfhzhhlthlhqhgqgttlmljmlmqqjddtqtctbblplddnqnzqnnzrzjrrqwrqqcfffbdfffspsqswstspsvppqmppdmppdvvfrfddqhqzqddtjddfqfrfllnjjcnnjzjmzmtmddbvdvzvbzzcjzzffdbdbsswshhrwrrfggpccszzzgdgvvlflwwdbbhqhffngffdfdmdgdhdmhdmdsspssctstdtdmdhhzvvcbbrqqmrmwwjmjqjmqjmjjjrmrmlmmbppmgpgttmptpspmmrttcddtjjspsfsqqbhbbzzgbzzznwzzlddmtdmdgmmlnljlvjjtgjjggmmnnvqnqzzfhzhttvbbprpmpmrmlrmllwmlwmlwwsjjlffbgfggqmggqgvglvvrpvrpvpnpphmhnmhhbbqjbbrrvfrfwflldffzwzccscqsqppctctddqbbmggmccdbdvbdvvpdpdbdsdjsjbbwpwcpcbcbmmzdmmvtvqvpvphhlblwwfmwmvvdhdtdwwlblglhhvfvwwqggrnrttpddtvvwqvqmqhhwnnghhbpbvbnvvdqqrqdqwqppmwpwhppnmnjmnjmjttvhhcgchcssrlrwllpdpndpdtptzppqqpvvtffcwffjppvnnjvvjnnwcwnnhlhjhsjsnjjzfjfsfhsssvttvfvsvpspppwswmswwqmwwzvwzzvtzvvwddqqzhhqpqjjwrwlrrbcbvvqllqjllvzvgvmvhmmsppwvpwphhjnndjjtpjtthzzvrrcwcrczzmqmsssvtstqtrrgtrtvtwtccbwcwrwbbdbgbmmcsmcssvjsjqqsnqqtvvbgbfbdffhjffvnnzpplqppzzfwfrfnfcncqccgjjcffhshrhgrhghvhphccqtcqtccjzccdnncggftgttrppnpptlltztqtjqqvfvqvdvmvmjjgqqrqgrqqcggdvvpcvcjvjnnrjjmbmlbmmqvmqmfmwmpwwnhwdtmvhqfwlbpzjplfhfntjgmvqmmjqpbngpvjvpgzpqwjjwhvjwwplrtjhzmzqmdrppgbrspmctlggmflbjzzfcvvdqlrtvqvwhcpjnmlvfgwrwwtblpqstddnqntnmwsbgjfrbdrlnvqdrnttshjmvpmncmggfdbnndwzmswmdvhmmwtgpfglrzzhwcsgvhnnrrhmnhftvvqfdfrsphzbslgscmwsnrwbvqphhswvpvsbbstvnndclhfhdctlvwrmdgzfcfmjmznqvvqrddmdlqznvcsqsgnpcqqhbdwqntcnqljstqvrzhgvzqdltpwmnpvjmqrpjsfhqvhchjnwjnqpdqbdjqdpqsqhbwwmhfthzbrsjnhncpbjrhgqlzmrzlnvrrfvlrmflcqfmqjzjwscrflgzwtbchfrnvsrrtncvhjbnnmlmmfdjcbmbsmgdtwzwcwnthfbsnrgdfwqjncqsdmfnfqgtcwrhjprlnhvrnpmnnhlwstvqjrsprqhjzszzgfznmgwjqglvfrrwpdbptdrnbbwbzbcbhbtcchmfsgmvnmrbdqhqgmvtfmvpgvjzjpgjbdhcfrfhprgdzrprccnhbmzdfjsgldlgpgdrfhbhtmhdttdsbndgbdfccqhhwhqfmlsfhsbbbmdncrwzcnrdvcmhllfwtrgjpgngzwptnqtggtcjwrptffmsrgdpctsdjtpssngsdqwfsbhdbcqvbdrzlhzlsbbzhqthzhcwsftlhrmhgpfzljgcphjjvhpqjzsfnrztwrhlnlbmgcgmstrbbwclpvdtdpclzlhmmpmmpmppnwjglhwppprlbzbvwqwmpgtvvpgdthnwbtblwpwgvmbcbjwjbczlcmzfwzbqvzsvgcmspvrsblldscqlgghdwzbvhhvgcfwgnqwlngclbjfwrpwtdjvqmzwwjztwdjplhzpzfslbbvfdsnpggwcttzwdlzgqgmrnpnclhrlngtwcwblzdjmpgqvzsvsdmzdwlgcdlccnnlrcvtrvspcsmgmzzvwnlzwtznwtqtdjcnhwrqhqrmvqqhrpdtnsmfrlcgpjcnddsqzcppgrnhvwsdbjvvtmvbjdncpdnmzfswmtvzfbdpqfjvwvqlhptnpdfdnlwfrgstpvvmhsqfgggdrsfgldfzbcjzhqzvfwmzccwjrslhjwlbmrpqgzdfnfbhsmdpzwtqnqldtqvshvlvmlnnmqrqbpwvnhqhtcbfclhrcqlqzhsqplsnbczvrbzqwlfwjdtmstzdbswtrvlpzzlrfvgdmldbwcttztrvsgzjwhhpcrvtgzfzppdlrdwswbnjfqqpqfbcqlzdmjsgjtzmvhdzspwlqpdjnccmbtdhnnhfvwqclbzzgglfgmvvgrccdsbwfmpvqwqrhmdzfhhhgbgjgwmnzmnggfrpspchvzpcmcpsbzgldmgqjqqdcjpwwncwrwjbhgzdbbcmbzbbtvprsjrhfwgsppdrrlzvnmtmwrmmrhtlndvsvjvgqmmttbbnpdhnjhwgrvlrdtpbrtwpwvvpslcqnvnrlhpvgdwnrzjmhwmgvpndtrjlzqpfzfbrsgbzjjqcfgsfwchblzstdflblngtzbrzrrvsczqvfhjjdlffrghgqvqfdtstqlnzllsrnnrtvrzdphbhdfpmhlfncqbdtzjqqcfbzpvgzdcsvvbfdvqrfrncbrwmpdmhnlqdscwnvldzblpzfqcvnbzmmtbmwjbczsjvzmfthfpvjcpwftqcbgjwflfrbrggwnvwndtncljfrdfwqwhfbctpjghfvnjnntnrgbfbmhplgmpfvmgvfqjslgnnrnlgztlstpcjwtlhmwlljcfmptfwsphnlsrjwmgtghgqmsvwvqsmblwpdftbrwjcdlzjmjblghszznqhsnqrcmtccgdwrrlsmwswvrjltqmwsdwvpnzltllhrsdvmrntdhtwwbgrqmrffnqbqrczvzchbgmzwtjtfzwntsnlbwbgrlvqjsqmdnwjqlwrdpnfpggzrjvtrhqdbmmbtfmmblgwtrqccqbjnljqflhgtphvrgrgghgrpbgfgdztsmfwrfflsqmrwbfjwsmpfrnbqjwnwdqwcwzpwbsmngjwfmbwdmnprdjnjbmqgfcbvtcvcthpmnmvvzdzgqqbhtjqfcdvhfzwqgfsbtvnwbzpmmtswfntjjppsswgbfrjbrstltdgbmclmbfvlslghbhnqqbdlzgtctgsfnwvbpzbvnwfbjmbfqcpqqvgrzwcbrwzdbdsjsslcjlmtprntpsdmqldzwqlqztwqtqfqzmrnzbtpqlfnsdwfdgggfvmqmrdqmnffnzcwfzsrqfpvrmsfsrbnpbhnqvdglvglllpggpmwmngrhzwgpdlzrbsvjtqmshhnlzwwftdtqwrqwgbbnczqcwmsvcljqlscftwflhwwhgnqwztfchdzsllrzbhbqwcfztjnqtdmsfnlzlcwzfmtlcgwclzfhhldgrnfjvzthzqzmzvwcrnhpdcwswpddsbwtznwlcwsnfqnqwnntngplwnfgwrcnpvgffwrcrszzdbfvzjmrmlrjwcvdvbglgncjwcnnpdfnwsrzsvzgnjrlqmwhvtdgmpbqmjthmhhmzjhpvnbvrqnlspdbcgshwlnvwpvrbcmvbvcsdmgwtmsthqtcfmllsfwvqcrbmdgqtzjwrg
\ No newline at end of file
diff --git a/rust/day6/src/main.rs b/rust/day6/src/main.rs
new file mode 100644
index 0000000..82d6634
--- /dev/null
+++ b/rust/day6/src/main.rs
@@ -0,0 +1,34 @@
+use std::collections::HashMap;
+use std::fs::read_to_string;
+
+fn is_duplicate(str: &String) -> Option<char> {
+    let mut char_hash: HashMap<char, u8> = HashMap::new();
+    for ch in str.chars() {
+        char_hash.entry(ch).and_modify(|x| *x = 2).or_insert(1);
+    }
+    str.chars().into_iter().find(|ch| char_hash[ch] == 2)
+}
+
+fn part_one(str: String) {
+    let (temp_str, str_iter) = str.split_at(4);
+    let mut count_str = temp_str.to_string();
+    let mut count = 4;
+    for ch in str_iter.chars().into_iter() {
+        match is_duplicate(&count_str) {
+            None => {
+                break;
+            }
+            Some(_) => {
+                count_str.remove(0);
+                count_str.push(ch);
+                count += 1;
+            }
+        }
+    }
+    println!("{}", count);
+}
+
+fn main() {
+    let file_content = read_to_string("input").unwrap();
+    part_one(file_content);
+}