Fix acronyms for camel case

acronyms.go

@@ -0,0 +1,5 @@
+package strcase
+
+var uppercaseAcronym = map[string]bool{
+	"ID": true,
+}

camel.go

@@ -60,6 +60,9 @@ func toCamelInitCase(s string, initCase bool) string {
 
 // ToCamel converts a string to CamelCase
 func ToCamel(s string) string {
+	if uppercaseAcronym[s] {
+		s = strings.ToLower(s)
+	}
 	return toCamelInitCase(s, true)
 }
 
@@ -68,6 +71,9 @@ func ToLowerCamel(s string) string {
 	if s == "" {
 		return s
 	}
+	if uppercaseAcronym[s] {
+		s = strings.ToLower(s)
+	}
 	if r := rune(s[0]); r >= 'A' && r <= 'Z' {
 		s = strings.ToLower(string(r)) + s[1:]
 	}

camel_test.go

@@ -40,6 +40,7 @@ func TestToCamel(t *testing.T) {
 		{"AnyKind of_string", "AnyKindOfString"},
 		{"odd-fix", "OddFix"},
 		{"numbers2And55with000", "Numbers2And55With000"},
+		{"ID", "Id"},
 	}
 	for _, i := range cases {
 		in := i[0]
@@ -58,6 +59,7 @@ func TestToLowerCamel(t *testing.T) {
 		{"", ""},
 		{"AnyKind of_string", "anyKindOfString"},
 		{"AnyKind.of-string", "anyKindOfString"},
+		{"ID", "id"},
 	}
 	for _, i := range cases {
 		in := i[0]