More changes

src/utilities/checks.rs

@@ -5,8 +5,8 @@ pub struct Checks {
 }
 
 impl Checks {
-    pub fn is_number(val: &String) -> bool {
-        return val.is_numeric();
+    pub fn is_numeric(text: &String) -> bool {
+        text.parse::<f64>().is_ok()
     }
 
     // TODO: Implement

src/utilities/conversions.rs

@@ -8,15 +8,15 @@ pub struct Conversions {
 impl Conversions {
     pub fn to_lower_char(val: &mut char) {
         if val.is_alphabetic() {
-            val = val.to_lowercase();
+            *val = val.to_lowercase().next().unwrap();
         }
     }
 
     pub fn initialize_values(&self) {
     }
 
-    pub fn print_value<T>(&self, val: T) {
+    pub fn print_value<T: std::fmt::Debug>(&self, val: T) {
         println!("Going to print value");
-        println!("{}", val);
+        println!("{:?}", val);
     }
 }