Adjust casing

exercises/practice/resistor-color-duo/.meta/example.gd

@@ -1,6 +1,6 @@
 const COLORS = ["black", "brown", "red", "orange", "yellow", "green", "blue", "violet", "grey", "white"]
 
-fun color-code(colors):
+fun color_code(colors):
     var tens = colors[0]
     var ones = colors[1]
     return tens * 10 + ones

exercises/practice/resistor-color-duo/resistor_color_duo.gd

@@ -1,2 +1,2 @@
-fun color-code(colors):
+fun color_code(colors):
     pass

exercises/practice/resistor-color-duo/resistor_color_duo_test.gd

@@ -1,9 +1,9 @@
 const TEST_CASES = [
-	{"test_name": "Brown and black", "method_name": "color-code", "args": ["brown", "black"], "expected": 10},
-	{"test_name": "Blue and grey", "method_name": "color-code", "args": ["blue", "grey"], "expected": 68},
-    {"test_name": "Yellow and violet", "method_name": "color-code", "args": ["yellow", "violet"], "expected": 47},
-    {"test_name": "White and red", "method_name": "color-code", "args": ["white", "red"], "expected": 92},
-    {"test_name": "Orange and orange", "method_name": "color-code", "args": ["orange","orange"], "expected": 33},
-    {"test_name": "Ignore additional colors", "method_name": "color-code", "args": ["green", "brown", "orange"], "expected": 51},
-    {"test_name": "Black and brown, one-digit", "method_name": "color-code", "args": ["black", "brown"], "expected": 1},
+	{"test_name": "Brown and black", "method_name": "color_code", "args": ["brown", "black"], "expected": 10},
+	{"test_name": "Blue and grey", "method_name": "color_code", "args": ["blue", "grey"], "expected": 68},
+    {"test_name": "Yellow and violet", "method_name": "color_code", "args": ["yellow", "violet"], "expected": 47},
+    {"test_name": "White and red", "method_name": "color_code", "args": ["white", "red"], "expected": 92},
+    {"test_name": "Orange and orange", "method_name": "color_code", "args": ["orange","orange"], "expected": 33},
+    {"test_name": "Ignore additional colors", "method_name": "color_code", "args": ["green", "brown", "orange"], "expected": 51},
+    {"test_name": "Black and brown, one-digit", "method_name": "color_code", "args": ["black", "brown"], "expected": 1},
 ]