feat: sort the entries before printing them

string.S

@@ -1,6 +1,4 @@
 /*
-    Current implementation only counts the bytes instead of characters.
-
     @args:
         r1 => pointer to the string
     @returns:
@@ -8,7 +6,7 @@
     @clobbers:
         r2
 */
-strlen:
+bytelen:
     mov r0, #0
 1:
     ldrb r2, [r1, r0]
@@ -19,7 +17,32 @@ strlen:
     b 1b
 
 /*
-    @input r1, r2 - pointers to the strings to compare
-    @return r0 - 0 if equal, -1 if a < b, 1 if a > b
+    @args:
+        r1 => pointer to first string
+        r2 => pointer to second string
+    @returns:
+        r0 => 0 if equal, -1 if a < b, 1 if a > b
+    @clobbers:
+        r1, r2, r3
 */
-strcmp: @ TODO: implement
+strcmp_ascii:
+@ comparison loop
+1:
+    ldrb r0, [r1], #1
+    ldrb r3, [r2], #1
+    cmp r0, r3
+    bne 2f
+    cmp r0, #0
+    bne 1b
+
+    @ strings are equal
+    mov r0, #0
+    bx lr
+
+@ if we found a different byte then return the appropriate integer
+2:
+    sub r0, r0, r3
+    cmp r0, #0
+    movlt r0, #-1
+    movgt r0, #1
+    bx lr