Change switch to badili and added numbers to allowed identifiers

Author: AvicennaJr

lexer/lexer.go

@@ -191,7 +191,7 @@ func newToken(tokenType token.TokenType, line int, ch byte) token.Token {
 func (l *Lexer) readIdentifier() string {
 	position := l.position
 
-	for isLetter(l.ch) {
+	for isLetter(l.ch) || isDigit(l.ch) {
 		l.readChar()
 	}
 	return l.input[position:l.position]

token/token.go

@@ -68,7 +68,7 @@ const (
 	CONTINUE = "ENDELEA"
 	IN       = "KTK"
 	FOR      = "KWA"
-	SWITCH   = "ENDAPO"
+	SWITCH   = "BADILI"
 	CASE     = "IKIWA"
 	DEFAULT  = "KAWAIDA"
 )
@@ -88,7 +88,7 @@ var keywords = map[string]TokenType{
 	"tupu":    NULL,
 	"ktk":     IN,
 	"kwa":     FOR,
-	"endapo":  SWITCH,
+	"badili":  SWITCH,
 	"ikiwa":   CASE,
 	"kawaida": DEFAULT,
 }