code: private boolean isCategorySystemService(Field field) {
  		
  		if(!(field.getName().endsWith("_service") 
  			|| field.getName().endsWith("_SERVICE"))) {
  			
  			return false;
  		}
  		
  		Field[] declaredFields = Context.class.getDeclaredFields();
  		
  		for (Field declaredField : declaredFields) {
  			
  			if(String.class.isAssignableFrom(declaredField.getType())
  				&& declaredField.getName().equalsIgnoreCase(field.getName())) {
  				
  				return true;
  			}
  		}
  		
  		return false;
  	}
docs: <p>Determines if this {@link Field} injection falls into
  {@link InjectionCategory#SYSTEM_SERVICE}.</p>
  
  <p>The {@link Field}'s <i>declared name</i> must match the
  respective constant in {@link Context} (case insensitive).
  For example, if an instance of {@link TelephonyManager} is
  to be injected, the field declaration should be:</p>
  
  <br><br>&nbsp;&nbsp;&nbsp;
  
  {@code TelephonyManager telephony_service;}
  
  @param field
  the {@link Field} whose {@link InjectionCategory} is to
  be resolved
  <br><br>
  @return {@code true} if it's {@link InjectionCategory#SYSTEM_SERVICE},
  <br><br>
  @since 1.1.0