Fixed useless_let_if_seq clippy warnings

Author: ZapAnton

vm/src/obj/objstr.rs

@@ -823,18 +823,20 @@ fn str_ljust(vm: &mut VirtualMachine, args: PyFuncArgs) -> PyResult {
 fn str_istitle(vm: &mut VirtualMachine, args: PyFuncArgs) -> PyResult {
     arg_check!(vm, args, required = [(s, Some(vm.ctx.str_type()))]);
     let value = get_value(&s);
-    let mut is_titled = true;
 
-    if value.is_empty() {
-        is_titled = false;
+    let mut is_titled = if value.is_empty() {
+        false
     } else {
         for word in value.split(' ') {
             if word != make_title(&word) {
                 is_titled = false;
                 break;
             }
         }
-    }
+
+        true
+    };
+
     Ok(vm.ctx.new_bool(is_titled))
 }
 
@@ -974,10 +976,8 @@ fn str_isdigit(vm: &mut VirtualMachine, args: PyFuncArgs) -> PyResult {
     let valid_unicodes: [u16; 10] = [
         0x2070, 0x00B9, 0x00B2, 0x00B3, 0x2074, 0x2075, 0x2076, 0x2077, 0x2078, 0x2079,
     ];
-    let mut is_digit: bool = true;
-
-    if value.is_empty() {
-        is_digit = false;
+    let mut is_digit = if value.is_empty() {
+        false
     } else {
         for c in value.chars() {
             if !c.is_digit(10) {
@@ -991,7 +991,9 @@ fn str_isdigit(vm: &mut VirtualMachine, args: PyFuncArgs) -> PyResult {
                 }
             }
         }
-    }
+
+        true
+    };
 
     Ok(vm.ctx.new_bool(is_digit))
 }