Clone in a terminal:
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class StringUtils */

#ifndef _Included_StringUtils
#define _Included_StringUtils
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     StringUtils
 * Method:    isAlpha
 * Signature: (Ljava/lang/String;)Z
 */
JNIEXPORT jboolean JNICALL Java_StringUtils_isAlpha
  (JNIEnv *, jclass, jstring);

/*
 * Class:     StringUtils
 * Method:    isEmpty
 * Signature: (Ljava/lang/String;)Z
 */
JNIEXPORT jboolean JNICALL Java_StringUtils_isEmpty
  (JNIEnv *, jclass, jstring);

#ifdef __cplusplus
}
#endif
#endif

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