Remove unnecessary code

src/eval.c

@@ -16,32 +16,6 @@ static struct Object *eval_list(
     struct Object *environment
 );
 
-struct Object *eval_str(
-    const char *const str,
-    struct Object *const environment
-) {
-    assert(str);
-
-    Tokens tokens = Tokens_new();
-    assert(tokens);
-
-    Lexer lexer = Lexer_new(tokens);
-    assert(lexer);
-
-    for (const char *chr = str; *chr; ++chr) {
-        Lexer_lex(lexer, *chr);
-    }
-    Lexer_lex(lexer, '\n');
-
-    LEXER_DELETE(lexer);
-    assert(Tokens_top(tokens));
-
-    struct Object *const program = parse(tokens);
-    TOKENS_DELETE(tokens);
-
-    return eval(program, environment);
-}
-
 struct Object *eval(
     struct Object *const object,
     struct Object *const environment

src/eval.h

@@ -3,7 +3,6 @@
 
 #include "object.h"
 
-struct Object *eval_str(const char * str, struct Object *environment);
 struct Object *eval(struct Object *object, struct Object *environment);
 
 #endif