From f7fdfe75bc72b174af1ee0e731b9156cbd167aa6 Mon Sep 17 00:00:00 2001
From: etrushko05 <etrushko05@mail.ru>
Date: Sat, 15 Nov 2025 04:53:50 -0500
Subject: [PATCH] 18

---
 str_lib.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/str_lib.c b/str_lib.c
index fa1d7db..c517cd4 100644
--- a/str_lib.c
+++ b/str_lib.c
@@ -7,7 +7,11 @@
 int
 mystrlen(const char *s)
 {
-	// <YOURCODE>
+	int length = 0;
+	while (s[length] != '\0') {
+    	    length++;
+    	}
+    	return length;
 }
 
 /*
@@ -17,7 +21,24 @@ mystrlen(const char *s)
 int
 mystr_idx(const char *s1, const char *s2)
 {
-	// <YOURCODE>
+    	int str_len = mystrlen(s1);
+    	int substr_len = mystrlen(s2);
+    
+	if (substr_len > str_len) {
+	        return -1;
+	}
+    
+	for (int i = 0; i <= str_len - substr_len; i++) {
+	        int j;
+	        for (j = 0; j < substr_len; j++) {
+            		if (s1[i + j] != s2[j]) {
+                		break;
+            		}
+        	}
+        	if (j == substr_len) {
+        	    return i;
+        	}
+    	}
 	return -1;
 }