Jenkins pipeline using secret credentials and password

pipeline
{
    agent { label 'master' }
    stages
    {
        
        stage('check_credentials')
        {
            steps
            {
            
              withCredentials([usernamePassword(credentialsId: 'c1', usernameVariable: 'uname', passwordVariable: 'upass' )]) 
              {
                sh '''
                   echo "usernamePassword = $uname $upass" > test.txt
                '''
              }
               
              withCredentials([usernameColonPassword(credentialsId: 'c1', variable: 'uname')]) 
               {
                sh '''
                  echo "usernameColonPassword = $uname" >> test.txt
                '''
              }
              withCredentials([string(credentialsId: 't1', variable: 'TOKEN')]) 
              {
                sh '''
                  echo "string = $TOKEN" >> test.txt
                '''
              }
              sh 'cat test.txt'
            }
        }
        
        
    }
}