chore: add tests for all utils, removed unused functions

utils/strings.go

@@ -16,28 +16,3 @@ func NoArticle(name string) string {
 	}
 	return name
 }
-
-func LongestCommonPrefix(list []string) string {
-	if len(list) == 0 {
-		return ""
-	}
-
-	for l := 0; l < len(list[0]); l++ {
-		c := list[0][l]
-		for i := 1; i < len(list); i++ {
-			if l >= len(list[i]) || list[i][l] != c {
-				return list[i][0:l]
-			}
-		}
-	}
-	return list[0]
-}
-
-func StringInSlice(a string, list []string) bool {
-	for _, b := range list {
-		if b == a {
-			return true
-		}
-	}
-	return false
-}